Improvement in saw-mills



N. PETERS, FHOTO-LTHOGRAFHER, WASHINGTON, Dv Cy To `all yzrlulmm't 'mayconccrn-- l y 4 Be known that I, Jnssn A. Donn, oi Williamsport, 1n thecounty of Lycoming and in the State of do hereby declare that lthefollowing duit-d sans* x 3151i @imita f l.Lasse A." Donn., orwrtmnnsron'r; PENNSYLVANIA y Letters maar No. 107,886, dated october4,1870.

- `lIVIPITiVEIVi'EIQ'I IN SAW-MILLS.

The Schedule referred lto in these Letters Patent and vmaking part ofthe same Pennsylvania, have invented certain new and useful Improvementsin Saw-Gates for SawingA Logs; and is a full, clear, and exactdescription thereof','reference being had to the accompanying drawing,and to thc letters of lreference marked thereon, ,in which drawing-Figure lfis a-front elevation of my device;

' Figure 2 is a sideelcvation of the same; and

" Figure 3-is a vertical cross-section of the top of t `the gate on theline xxfof fig. 1. i

Letters oflikejname and kind refer to like parts ir each of thefigures.` s

.Thenature of my invention relates to saw-gates, constructed andarranged for' slabbing logs, and for sawing logs into lumber; and f Theinvention `consists in the means employed for making two vertical up anddown saws,- laterally and l independently adjustable vwhile in motion,and in the combination and arrangement of its variousd parts, allas'more particularlyhereinafter described.

A represents the sawgate,fwhich is intended Vto be secured in anyordinary method in a sawfmill, `the motive power being'lapplid toityinany usual way.' f

This gate is constructed'with two side pieces,`B, arrangedperpendicularlyand made solidly, of suitp able' material, with a top, 0,and a bottom, D, each.`

composed of two pieces of metal, of the form shown.

in the drawing, which pieccscross the side pieces at right angles, andare let into them near their upper and lower ends respectively,`andproperly secured thereto.l l l j Y p "i .The ends C' and D of these topand bottom pieces project a short distance beyond the outsides oftheside piecesbeforenamed.

Two saws, E, are strained to said top and bot- "tom pieces by` means"ofstraps, ll and Ff, which bend respectively up over the top piecc,andYdown over the bottom piece aforesaid.

"lhe strap [1".embra.ces` a truck, G, more fully `described hereinafter,and projects a little above said.

trnck,whcre it has 1a' slot, a, passing through both sides of it. A j yThe top `of the truck G has a `correspondingr groove, through whichlslot` and groovepasses a `wedge-key, b, upon the under side ofazlocking-key, c,

i whose' upturned shoulders embrace the outsides of the strap,l and keepthem together, while the key b secures the strap andftrucktogether, andservesv to` strainv the saw. d.

rJhe bentl portion or the bight of the-strap, exf

tending below the bottom of the top piece (l, has a slot, d, in it, ofsufficient size to admit the end' of the saw, which is held 'in placethere by a pin, c, which passes through it.

The .lower end of the saw is attached iu similaimanner to the strap F,and said strap is arranged, .with regard to the bottom pieceD andV itstruck G,

like the strap F, except .that it does not project below said truck,Vand is directly secured to it by screws. 1

Rods H pass vertically through the ends G and D', rotating in them, oneach side of the gate, and have at either end lbevel-gears I, whichimesh at the top and bottom'with bevel-gears J, which, in turn, aresecured to the rods K, whichl pass through and rotatein the top `andbottom ends oi' the side pieces B and the trucks G. Y

The last named rods have screw-threads cut in them, to lit intocorresponding screw-threads `in the trucks G, and have, also, shouldersf next the ont-- sides of the-side pieces B, so that they may not havevlateral play in their bearings.

The length of each pair of these-'rods is a little less than the widthofthe whole gate.

y The trucks G, of the shape portrayed in fig. 1,

have offsets g at their bases, whichcontain 4rollers h, which turn insemicircnlar bearings in said oisets,

and cause the trucks to roll smoothly upon the top and bottom ofthe-frame.

The rollers having a greater diameter in their'centers, and less underthe hearings, are thus made with shoulders, which press at either endagainst the inner sides of the plates composing the top piece C andbottom piece D, and are thus secured against lateral deviation.

The rods H pass up and 'down through suitable bearings L near the centerof the frame, which bearings have, upon their upper front port-ions,bevelgears M, perforated in the center, so as to admit the passage ofthe rods H through them, and permit them to turn freely' upon said rods,which, bevclgears, in turn, mesh with bevel-gear N, secured to shaftsj,passing through the bearings L from front A to rear.

Upon the4 rear ends ofthe shafts just named handwheels O are properlyattached.-

These bearings are also secured to two vertical guides P, each in rearof the side pieces B, upon which the sawframe also traverses up anddown,

said guides passing through suitable arms secured to said side 'pieces`immediately above and below the *cross pieces D and G respectively.

. In the operation of thisdevice each of the saws E canbe adjustedlaterally and independently of each other, so that thegate may be usedfor slabbing logs,

ing,r lumber, so that a. boa-rd may be taken iiom one' side :md :t plankfrom the other; and this adjust'- ment may be made while the saws are inmotion, and

without shutting oi the power.

Having thus described this device,

Vha-t I claim therein as my invention is- 1. The trucks G, constructedas described :in shown, in combination wit-h the top and bottom pieces Cand D, and the screws K, for the purposes set forth.

2.' The combination of 'the trucks G, the top and bottom' pieces C andD, the screws K, and the sewgnte'A, substantially as described :mdshown, for the purposes set -forth.

In testimony that I claim the foregoing, I have hereunto set my handthis 15th day of August, 1870.

JESSE A. DORR.

J. A. BEEBER, E. ANDREWS.

